OPINION
COCHRAN, J.,
delivered the opinion of the Court
in which PRICE, WOMACK, JOHNSON, KEASLER, HERVEY, and HOLCOMB, JJ., joined.
Appellee, Michael Harvey Sheppard, was charged with possession of methamphetamine and possession of chemicals with intent to manufacture methamphetamine. He filed a motion to suppress evidence that the trial court granted after an evidentiary hearing. The State appealed, arguing that the officer’s conduct was reasonable under the Fourth Amendment. The specific question before us is whether a person is “arrested” for purposes of the Fourth Amendment if he is temporarily handcuffed and detained, but then released.1 The. answer is no — a person who has been handcuffed has been “seized” and detained under the Fourth Amendment, but he has not necessarily been “arrested.” The trial judge was mistaken in his belief that a temporary investigative detention equals an arrest under federal or Texas search and seizure law. The court of appeals then mistakenly speculated about possible unexpressed fact findings or credibility assessments by the trial judge.2 Because the trial judge did not include [284]*284these possible credibility assessments or new facts in his express written findings, it was error for the court of appeals to create and consider them.3 We therefore reverse the judgment of the court of appeals and remand this case to the trial court for further proceedings.
I.
At the hearing on appellee’s motion to suppress, Anderson County Deputy Sheriff John Smith testified that he received a dispatch call about an assault at Lot No. 14 in Red Rock Ranch. He met the complainant, Arthur Schneider,4 at a nearby convenience store. Mr. Schneider explained that he and another friend, Elizabeth Miley, had been “sitting around” in appellee’s trailer “doing some speed” when appellee threatened him with a knife. Deputy Smith then followed Mr. Schneider to appellee’s trailer to investigate.
Deputy Smith knocked on the door and, when appellee opened it, the first thing the officer noticed was a “very strong chemical odor coming out of the trailer.”5 On cross-examination, Deputy Smith testified that he had a reasonable suspicion that appellee was engaging in criminal activity at the time he opened his front door because of that strong chemical odor coming out of the house. Deputy Smith then frisked appellee and found a large folding knife in his front pocket. The officer handcuffed appellee and told him that “he was just being detained at the time until [Deputy Smith] could secure the scene.”
He testified that he handcuffed appellee for “officer safety” while he walked through the trailer to make sure that there was no one else inside. He explained that he was trying to account for Elizabeth Miley, the third person that Arthur Schneider had told him about: “To make sure they weren’t laying in [there] dead, stabbed to death. There had already been a complaint of someone pulling a knife.” As Deputy Smith walked through the trailer, he saw, in plain view, a small dining table that had a clear plastic bag on it, a purse with some needles in it, and an open orange box with a powdery substance in it.
After Deputy Smith was assured that no one else was inside, he walked back out and released appellee from the handcuffs. He called the drug task force to come because he didn’t know if this was a meth lab, and he didn’t know anything about meth labs. He asked appellee if he would sign a consent to search form. Appellee did so. They both waited outside until the drug task-force members arrived and began to search the trailer. They discovered that the strong chemical smell had come from a pitcher underneath the sink with crushed-up pills and some type of solvent or acetone in it. The officers also found methamphetamine and a variety of methamphetamine-manufacturing materials.
After hearing the evidence, the trial judge asked the prosecutor and defense counsel a number of questions concerning the legal principles involved, and ultimately he granted the motion to suppress, stating that “the bottom line for me ... that [285]*285I’m sitting up here trying to defin[e] is does this constitute a reasonable search?"6 The trial judge then entered written find- , . ... ,, , mgs of fact and conclusions of law that , , i i • • i j were based upon legal principles and the application of those principles to the officer’s testimony. They were not based on the officer’s credibility or any disputed evidence.7
II.
The State appeaied, and the Tyler Court of Appeals upheld the trial judges ultimate ruling, although it disagreed with a ⅛ a, number oi his ⅛*1 inclusions.8 The coin’t of appeals first noted that there were sufficient “objective facts that could have [286]*286supported a frisk and detention.”9 Mr. Schneider had called the police and reported that appellee threatened him with a knife — a felony offense of aggravated assault with a deadly weapon.10 Mr. Schneider also reported that the assault occurred while he, appellee, and a woman, Elizabeth Miley, were sitting around “doing speed” — using methamphetamine — another felony offense. Deputy Smith and Mr. Schneider drove separately to appel-lee’s house to investigate. When appellee opened the door, Deputy Smith smelled the strong odor of chemicals. This strong odor corroborated Mr. Schneider’s description of the trio “doing speed.” Deputy Smith then frisked appellee because Mr. Schneider had said that appellee had threatened him with a big knife. As the court of appeals stated,
If believed, these facts could support the conclusion that Appellee was armed and presented a danger as well as a reasonable suspicion that he was involved in criminal activity.11
But, because the trial judge made the legal conclusion that “[t]he ‘pat down or frisk of defendant’ was without justification and therefore illegal,” the court of appeals reasoned that the trial judge must not have believed Deputy Smith.12 That is not necessarily so. In fact there is nothing in the hearing record or the findings of fact that would indicate that the trial court did not believe Deputy Smith or his factual testimony.13 The written factual findings are entirely consistent with Deputy Smith’s testimony.
When the trial court makes explicit findings of fact, as was done in this case, those are the facts to which we must give deference. And when a trial court makes an explicit credibility finding, we must give deference to that credibility determination. But we cannot conjure up new and different factual or credibility findings when the trial court has made his findings explicit. That is precisely the point of having trial judges make express factual findings: the appellate courts will not have to guess at what the trial court’s factual findings and credibility assessments were. In this case, it is clear that the trial court simply did not believe that what Deputy Smith did was reasonable under the Fourth Amendment. The trial court was mistaken on the law.
Appellate courts review the legal determination of detention, reasonable suspicion, and probable cause under the [287]*287Fourth Amendment de novo
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OPINION
COCHRAN, J.,
delivered the opinion of the Court
in which PRICE, WOMACK, JOHNSON, KEASLER, HERVEY, and HOLCOMB, JJ., joined.
Appellee, Michael Harvey Sheppard, was charged with possession of methamphetamine and possession of chemicals with intent to manufacture methamphetamine. He filed a motion to suppress evidence that the trial court granted after an evidentiary hearing. The State appealed, arguing that the officer’s conduct was reasonable under the Fourth Amendment. The specific question before us is whether a person is “arrested” for purposes of the Fourth Amendment if he is temporarily handcuffed and detained, but then released.1 The. answer is no — a person who has been handcuffed has been “seized” and detained under the Fourth Amendment, but he has not necessarily been “arrested.” The trial judge was mistaken in his belief that a temporary investigative detention equals an arrest under federal or Texas search and seizure law. The court of appeals then mistakenly speculated about possible unexpressed fact findings or credibility assessments by the trial judge.2 Because the trial judge did not include [284]*284these possible credibility assessments or new facts in his express written findings, it was error for the court of appeals to create and consider them.3 We therefore reverse the judgment of the court of appeals and remand this case to the trial court for further proceedings.
I.
At the hearing on appellee’s motion to suppress, Anderson County Deputy Sheriff John Smith testified that he received a dispatch call about an assault at Lot No. 14 in Red Rock Ranch. He met the complainant, Arthur Schneider,4 at a nearby convenience store. Mr. Schneider explained that he and another friend, Elizabeth Miley, had been “sitting around” in appellee’s trailer “doing some speed” when appellee threatened him with a knife. Deputy Smith then followed Mr. Schneider to appellee’s trailer to investigate.
Deputy Smith knocked on the door and, when appellee opened it, the first thing the officer noticed was a “very strong chemical odor coming out of the trailer.”5 On cross-examination, Deputy Smith testified that he had a reasonable suspicion that appellee was engaging in criminal activity at the time he opened his front door because of that strong chemical odor coming out of the house. Deputy Smith then frisked appellee and found a large folding knife in his front pocket. The officer handcuffed appellee and told him that “he was just being detained at the time until [Deputy Smith] could secure the scene.”
He testified that he handcuffed appellee for “officer safety” while he walked through the trailer to make sure that there was no one else inside. He explained that he was trying to account for Elizabeth Miley, the third person that Arthur Schneider had told him about: “To make sure they weren’t laying in [there] dead, stabbed to death. There had already been a complaint of someone pulling a knife.” As Deputy Smith walked through the trailer, he saw, in plain view, a small dining table that had a clear plastic bag on it, a purse with some needles in it, and an open orange box with a powdery substance in it.
After Deputy Smith was assured that no one else was inside, he walked back out and released appellee from the handcuffs. He called the drug task force to come because he didn’t know if this was a meth lab, and he didn’t know anything about meth labs. He asked appellee if he would sign a consent to search form. Appellee did so. They both waited outside until the drug task-force members arrived and began to search the trailer. They discovered that the strong chemical smell had come from a pitcher underneath the sink with crushed-up pills and some type of solvent or acetone in it. The officers also found methamphetamine and a variety of methamphetamine-manufacturing materials.
After hearing the evidence, the trial judge asked the prosecutor and defense counsel a number of questions concerning the legal principles involved, and ultimately he granted the motion to suppress, stating that “the bottom line for me ... that [285]*285I’m sitting up here trying to defin[e] is does this constitute a reasonable search?"6 The trial judge then entered written find- , . ... ,, , mgs of fact and conclusions of law that , , i i • • i j were based upon legal principles and the application of those principles to the officer’s testimony. They were not based on the officer’s credibility or any disputed evidence.7
II.
The State appeaied, and the Tyler Court of Appeals upheld the trial judges ultimate ruling, although it disagreed with a ⅛ a, number oi his ⅛*1 inclusions.8 The coin’t of appeals first noted that there were sufficient “objective facts that could have [286]*286supported a frisk and detention.”9 Mr. Schneider had called the police and reported that appellee threatened him with a knife — a felony offense of aggravated assault with a deadly weapon.10 Mr. Schneider also reported that the assault occurred while he, appellee, and a woman, Elizabeth Miley, were sitting around “doing speed” — using methamphetamine — another felony offense. Deputy Smith and Mr. Schneider drove separately to appel-lee’s house to investigate. When appellee opened the door, Deputy Smith smelled the strong odor of chemicals. This strong odor corroborated Mr. Schneider’s description of the trio “doing speed.” Deputy Smith then frisked appellee because Mr. Schneider had said that appellee had threatened him with a big knife. As the court of appeals stated,
If believed, these facts could support the conclusion that Appellee was armed and presented a danger as well as a reasonable suspicion that he was involved in criminal activity.11
But, because the trial judge made the legal conclusion that “[t]he ‘pat down or frisk of defendant’ was without justification and therefore illegal,” the court of appeals reasoned that the trial judge must not have believed Deputy Smith.12 That is not necessarily so. In fact there is nothing in the hearing record or the findings of fact that would indicate that the trial court did not believe Deputy Smith or his factual testimony.13 The written factual findings are entirely consistent with Deputy Smith’s testimony.
When the trial court makes explicit findings of fact, as was done in this case, those are the facts to which we must give deference. And when a trial court makes an explicit credibility finding, we must give deference to that credibility determination. But we cannot conjure up new and different factual or credibility findings when the trial court has made his findings explicit. That is precisely the point of having trial judges make express factual findings: the appellate courts will not have to guess at what the trial court’s factual findings and credibility assessments were. In this case, it is clear that the trial court simply did not believe that what Deputy Smith did was reasonable under the Fourth Amendment. The trial court was mistaken on the law.
Appellate courts review the legal determination of detention, reasonable suspicion, and probable cause under the [287]*287Fourth Amendment de novo while granting great deference to a trial court’s factual findings.14 The United States Supreme Court has long held that an officer has the right to briefly detain and investigate a person when the officer has a reasonable suspicion that the person is involved in criminal activity.15 That officer may also conduct a limited “pat down” of a person if the officer has a reasonable belief that the person is armed and dangerous.16
Here, Deputy Smith had two distinct bases for a Fourth Amendment “pat down”: he was investigating a complaint of a recent assault with a large knife, and he was investigating Mr. Schneider’s admission of “doing speed” at appellee’s home.17 According to the trial judge’s explicit factual finding, “Deputy Smith noticed a strong chemical odor coming from the residence.” Officer Smith was not required to testify that he was “afraid” of appellee or explicate each fact that led him to frisk appellee for “officer safety.” 18 The trial court’s factual findings include a statement that Deputy Smith “gave no valid reasons or basis for his concerns” before frisking appellee. He did not need to; the objective facts that the trial court found speak for themselves: a reasonable and prudent police officer investigating a recent assault involving a knife in a residence where the alleged attacker and victim were using methamphetamine would conduct a brief “pat down” or frisk to see if the person still had that weapon on him.19 As the court of appeals correctly noted, an “officer safety” frisk is based upon objective criteria, not upon the officer’s subjective state of mind or his asserted rationale:
To support a protective frisk or detention, there must be facts that, when reviewed under an objective standard, would cause a reasonably cautious person to believe that the action taken was [288]*288reasonable or that the person frisked was presently armed and dangerous.20
Thus, the court of appeals correctly concluded that Deputy Smith’s “failure to articulate a lawful basis for the frisk or detention does not mean that they were illegal.”21 The court of appeals concluded that, viewed objectively, Deputy Smith’s testimony supported appellee’s frisk and detention.22 As we noted in O’Hara v. State,23 regardless of whether a police officer states that he was afraid of the suspect, “the validity of the search must be analyzed by determining whether the facts available to [the officer] at the time of the search would warrant a reasonably cautious person to believe that the action taken was appropriate.”24
Because the objective facts supported the appropriateness of Deputy Smith’s action, the trial court erred in its conclusion of law “that the ‘pat down’ was without justification and therefore illegal.” Although the court of appeals recognized that Deputy Smith’s actions were objectively reasonable and appropriate, it mistakenly accepted the trial court’s legal finding by speculating that the trial judge must have disbelieved Officer Smith when his explicit fact findings show otherwise.25 Had the trial judge disbelieved Deputy Smith, he surely would have said so, or at least he would have phrased his factual findings with an implied caveat of “Deputy Smith testified that ..., but I find that ...” The trial judge’s findings in this case set out Deputy Smith’s perceptions and actions as historical fact, not testimonial contrivance.
The court of appeals also upheld the trial court’s conclusion that Deputy Smith “arrested” appellee for Fourth Amendment purposes when he temporarily detained and handcuffed him. The appellate court stated:
Giving due deference to the factual determinations made by the trial court, we [289]*289cannot conclude that the trial court erred when it determined that the deputy arrested Appellee. The deputy walked to Appellee’s front door and placed the man in handcuffs. A reasonable person could conclude that he was not free to leave at that point.26
Indeed, appellee was not free to leave at that point; he was being temporarily detained while Officer Smith conducted his investigation. That is precisely what Terry permits — a temporary detention, in which the person is not free to leave, while the police officer investigates whether a crime has been committed.27 But a Fourth Amendment Terry detention is not a custodial arrest, and the use of handcuffs does not automatically convert a temporary detention into a Fourth Amendment arrest.28 As Professor LaFave explains, handcuffing a person who has been temporarily detained “is not ordinarily proper, but yet may be resorted to in special circumstances, such as when to thwart the suspect’s attempt to ‘frustrate further inquiry.’ ”29
In the present case, the trial court made factual findings that appellee “was placed in handcuffs and informed that he was not under arrest but only being detained until the scene could be secured,” and then [290]*290“Deputy Smith checked the residence for ‘officer safety’ and for welfare concerns due to complainant saying there were three people present.” These factual findings are supported by the record. Deputy Smith testified that he made that brief walk-through30 of appellee’s trailer because Mr. Schneider had told him that a third person, Elizabeth Miley, had been with the two men when appellee threatened Mr. Schneider with a knife. He wanted “[t]o make sure they weren’t laying in [there] dead, stabbed to death: There had already been a complaint of someone pulling a knife.”31
This was a reasonable course of conduct under the Fourth Amendment. An objectively reasonable and prudent police officer could both (1) temporarily handcuff Mr. Sheppard, who had allegedly just threatened another person with a large knife while using methamphetamine and who still had that knife on his person; and (2) make a brief sweep of the rest of Mr. Sheppard’s trailer to see if Ms. Miley was still present — either as a victim or as someone who posed a danger to Officer Smith during his investigation. As soon as Deputy Smith completed the brief sweep, he uncuffed appellee, and they both went outside.
An “arrest” under the Fourth Amendment is a greater restraint upon a person’s freedom to leave or move than is a temporary detention, which also restrains a person’s freedom.32 As Professor Dix has noted, Article 15.22,33 which provides that “[a] person is arrested when he has been actually placed under restraint or taken into custody,” is “of no help” in determining whether that person has been subjected to a Fourth Amendment arrest or an investigatory detention.34 That statute, drafted long before Terry v. Ohio,35 has been called “legislatively obsolete” because it does not distinguish between custodial arrests and temporary detentions.36 [291]*291Although there is no “bright-line” rule to distinguish the two, Professor Dix notes that Texas cases are generally categorized as an “arrest” or “detention” depending upon several factors, including the amount of force displayed,37 the duration of a detention, the efficiency of the investigative process and whether it is conducted at the original location or the person is transported to another location, the officer’s expressed intent — that is, whether he told the detained person that he was under arrest or was being detained only for a temporary investigation, and any other relevant factors.38 “If the degree of incapacitation appears more than necessary to simply safeguard the officers and assure the suspect’s presence during a period of investigation, this suggests the detention is an arrest.”39 Although that may not be a fully adequate statement of the distinction between a Fourth Amendment arrest and a temporary detention, it is clear that Officer Smith did not handcuff appellee for longer than was necessary to make a brief “sweep” of the trailer; he told appellee that he was handcuffing him solely for that purpose; he uncuffed him as soon as he was done; and he told appellee that he was not under arrest. Given the totality of these circumstances, “a reasonable person would believe the seizure was to be sufficiently nonintrusive as to be only an ‘investigative detention.’ ”40 This is a legal conclusion, and we review ele novo the application of legal principles to historical facts.
The trial judge was simply mistaken about the legal significance of the facts that he found. As a matter of law, these facts support a finding that Officer Smith’s conduct and appellee’s temporary detention were reasonable under the Fourth Amendment.
The court of appeals noted that the trial court made a factual finding that “Deputy Smith did not have specific articulable facts to support a reasonable suspicion to believe the defendant was engaged in criminal activity to justify the search of defendant or placing him in handcuffs.” 41 But this is not a “factual” finding-factual findings are who did what, when, where, how, or why. They also include credibility determinations. They do not include legal rulings on “reasonable suspicion” or “probable cause”; those are legal conclusions subject to de novo review, not deference.42 It was only by speculating about credibility determinations that are not part of the trial judge’s written factual findings that the court of appeals upheld the trial judge’s suppression ruling.
[292]*292The problem in this case has been mixing the apples of explicit factual findings with the oranges of conclusions of law. The trial judge’s historical factual findings are supported by the record. His conclusions of law do not flow from those factual findings. However, this case should serve as an example of why explicit, written factual findings are so important to defendants, prosecutors, and reviewing courts. Explicit factual findings relieve the parties and the appellate courts from the need to speculate about the possible historical facts that the trial judge might have found or credibility judgments that the trial judge did or did not make. They also permit the reviewing court to focus solely on the validity of the trial judge’s application of the law to the specific facts that he actually found.43
In sum, because there is no indication that the trial judge disbelieved Deputy Smith’s testimony,44 the trial court erred, as a matter of law, in granting the motion to suppress. The objective facts support the legal conclusion that Deputy Smith’s actions in (1) temporarily detaining appellee; (2) patting him down for the knife that Mr. Schneider said he had been threatened with; (3) temporarily handcuffing appellee while making a quick inspection of the house to look for Ms. Miles; (4) noticing the drug paraphernalia in plain view on a table, and (5) requesting and obtaining appellee’s consent to a full search by drug task-force officers were reasonable under the Fourth Amendment and Texas law.
We therefore reverse the judgment of the court of appeals and remand this case to the trial court for further proceedings.
KELLER, P.J., concurred in the result.
MEYERS, J., filed a dissenting opinion.